$B6/182: RS232 Output Byte Buffer/Tape Read Error Flag
Kernal-Reference:
LDA $B6 : $FA95 $FAEB $FB2F $FBDC
LSR $B6 : $EEC1
ROR $B6 : $FBC9
STA $B6 : $EF28 $FA5B $FAE9
STX $B6 : $FC8F
STY $B6 : $FB2D
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